Consider Using With:

How is This Treatment Constructed?

Structural backfill is placed in 8-inch lifts, and "keyed-in" to the adjacent existing slope at least 6.5 feet horizontally. Lifts of backfill are brought to 90% compaction by tractors (track-mounted crawlers).

Following placement of the first geosynthetic reinforcement layer (and at every other primary geosynthetic reinforcement layer thereafter) coir netting is placed and fastened longitudinally with fabric anchors.

A layer of local topsoil and compost is placed on top of the coir netting.

A layer of locally harvested cuttings is placed on top of the local topsoil and compost growth media.

Placement of structural backfill and geosynthetic reinforcement continues in layers, like a cake. At every other geosynthetic reinforcement layer, typically every 4' on-center, the coir netting is draped or flapped over the slope face, and a layer of harvested cuttings, topsoil, and compost is put in place.

Note: This typical section is schematic only and can not be used in a contract document. The scale, key dimensions, and critical details have purposely been omitted.

Photos of Installation

Photographs of installation sequence for coir flap with brush layering.

Since this treatment does not require wrapping the backfill, it is less labor intensive to construct than the Coir Confinement.

Slopes greater than 2:1 (H:V) are too steep to be compacted by trackwalking. Coir confinement provides the resistive force necessary to hold the soil firmly in place in lieu of trackwalking.

The slope face is stabilized and protected as the embankment is constructed. In the event of a sudden storm event exposed soil surfaces are protected. Construction can resume rapidly following a storm event.

Yields a stable and visually aesthetically pleasing slope compatible with its natural surroundings.

Fill slopes steeper than 2:1 (H:V) will typically require reinforcement by a geosynthetic fabric such as a geogrid. Geosynthetic reinforcement strength needs to be sufficient to meet slope engineering requirements and should be specified by a geotechnical engineer.